Collapsible scaffold



May 3, 1932. BALL 1,856,149

COLLAPS IBLE S CAFFOLD Filed Aug. 2, 1930 I/Ym/YroR.

A r ram 5y Patented May 3, 1932 UNITED STATES HOWARD BALL, F LONG BEACH, CALIFORNIA COLLAPSIBLE SGAFFOLD Application filed August 2, 1930. Serial No. 472,554.

This invention relates to a collapsible scaffold particularly useful to artisans who work a considerable distance above the floor or ground, such as lathers, plasterers, painters, carpenters, and the like.

The prime object of my invention is to provide a novel collapsible scaffold which is simple in construction and inexpensive to manufacture.

Another object is to provide a novel seaffold of the character stated preferably on tirely formed of metal and which can be quickly and easily adjusted to various heights.

A further object is to provide novel scaffold the plank supporting head of which can be adjusted so as to engage either the side or the edge of the plank.

Other obi ects, advantages, and features of invention may appear from the accompanying drawings, the subjoined detailed description, and the appended claims.

In the drawings Figure 1 is a side elevation of my collapsihle scaffold.

Figure 2 is an end View of the same.

Figure 3 is a sectional view taken on line 3, 3 of Figure 1.

Figure 4 is a sectional View taken on line 4L, 1 of Figure 1.

Figure 5 is a fragmentary side elevation of the post.

Figure 6 is a fragmentary bottom plan view of one of the head members.

Figure 7 is a fragmentary side elevation of one of the head members.

Figure 8 is an end view of one of the head members.

Figure 9 is a side elevation of the head in position to receive the edge of the plank.

Figure 10 is a fragmentary side elevation of the post and the supporting logs.

Referring more particularly to the draw ings, my scaffold comprises a three-legged base 1, two of the legs being formed from a single length of angle iron bent into the shape of an inverted U, as shown at 2. The third leg 3 is also formed of a single length of angle iron and the upper end thereof is 'bent inwardly, as at 4, so as to engage the adjustable post 5. The legs 2 also engage the post 5, as shown in Figures 2 and 3. The legs 2, 3 are pivotally mounted upon a guide spider 6. This spider is formed with a central circular guide portion through which the post 5 extends. The legs 2, 3 are pivotally secured to the spider so that they can be folded inwardly when the scaffold is not in use.

The legs are held in expanded position and the post 5 is held in its adjusted position by the following means: A lip 7 is bent upwardly at the top of the leg 3 and this lip engages thepost 5. A hook 8 partly encircles the upturned lip 7 and also extends 55 through the legs 2. A nut 9 screws onto the outer end of the hook 8 and presses against the leg 2. Thus, when the nut 9 is tightened the hook forces the legs 2, 3 tightly against the post 5 and holds the scaffold in operative position. When the hook is tightened it also serves to prevent the post 5 from sliding up or down.

A head. 10 is removably mounted on the top of the post 5 and this head includes a pair of arms 11, 12 each of which is formed with a circular hub 13. The hubs are formed with two intersecting arcuate recesses 14, 1 1 Which it around the top of the post 5. A slot 14 is formed in the top of the post and a bolt 15 extends through the hubs 13 and fits in the slot 14. This bolt serves to hold the arms 11, 12 together and alsoclamps them in position on the post.

The arms can be extended, as shown in Figure 1, or they can be moved upwardly, as shown in Figure 9, by loosening the bolt 15 and sliding the post 5 into the co-ineidental recesses 14. The bolt 15 always fits into the slot 14" and prevents relative rotation of the head and the post.

Having described my invention, I claim: 1. A collapsible scaffold comprising three legs, two of said legs being formed of a 5 single strip of metal, a spider to which each of the legs is pivotally secured, a vertical post, said spider encircling the post, the upper ends of said legs engaging the post, and means clamping said legs to the post whereby the legs are held in extended position and the post is prevented from moving. 2, A collapsible scaffold comprising three legs, two of said legs being formed of a single strip of metal, a spider to which each of the legs is pivotally secured, a vertical post, said spider encircling the post, the upper ends of said legs engaging the post, a hook, said hook extending through one of the legs and engaging the other legs, said hook partly surrounding the post, and aunt screwed onto the hook and bearing against the legs whereby said legs are clamped about the post.

3. A collapsible scaffold comprising three legs, two of the legs being formed of a single strip of metal, a spider, each of said legs being pivotally secured to the spider, a vertical post, said spider encircling the post, each of said legs engaging the post, a lip on one of the legs, a hook, said hook extending through the two integrally formed legs, said hook engaging the lip on the third leg, and a bolt screwed onto the hook, whereby said legs are clamped to the post.

4-. A collapsible scaffoldycomprising three legs, two of said legs being formed of a single strip of metal, a spider to which each of the legs is pivotally secured, a vertical post, said spider encircling the post,the upper ends of said legs engaging the post, a hook, said hook extending through one of the legs and engaging the other legs, said hook partly surrounding the post, and a nut screwed onto the hook and bearing against the legs whereby said legs are clamped about the post, ahead removably mounted on the top of the post, said head comprising a pair of arms, a hub on each of the arms, said hubs fitting around the post, a bolt extending through the hubs, said post having a slot to receive the bolt, and said arms being adapted to be secured in either horizontal or vertical position.

5. A collapsible scaffold comprising three legs, two of the legs being formed of a single strip of metal, a spider, each of said legs being pivotally secured to the spider, a vertical post, said spider encircling the post, each of'said legs engaging the post, a lip on one of the legs, a hook, said hook extent,- ing through the two integrally formed legs, said hook engaging the lip on the third leg, a bolt screwed onto the hook, whereby said legs are clamped to the post, a head removably mounted on the top of the post, said head comprising a pair of arms, a hub on each of the arms, said hubs fitting'a-round the post, a bolt extending through the hubs, said post havinga slot to receive the bolt, and said arms being adapted to be secured in either horizontal or vertical position.

In testimony whereof I afiix my signature.

HOWARD BALL. 

